10 mins
(A)
There are 9kg watermelons being sold right now. However not all sizes are truly completely the same. The lightest are
7 kg to heaviest to 9.2 kg. The standard deviation is 0.5 kg.
(1)
What is the percentage between 7 to 9 kg
(2)
What is the percentage lower than 7kg
(B)
(1)what is between the(x)kg percentage of 87.5
(2) what is between the (x)kg percentage of 67.5